The Treaty of Trianon forced this country to give up three-fourths of its territory.
Hungary. The 1920 Treaty of Trianon was forced upon Hungary by the victorious Allies after WWI and resulted in Hungary giving up three-fourths of its territory to Romania, Czechoslovakia and the Kingdom of Serbs, Croat and Slovenes. Hungary lost more than half its population, including some 3 million Hungarians.
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